My 2c that doesn't put a value, but is rather a discussion on market appeal.
Chips that are themed with a grand inlay make it hard for just anyone to use it. Not as universally interchangeable and not customizable, like a lot of other chips are. Mint condition is a plus certainly.
Usability and appeal varies, but for me, it's difficult to find a use for it, since it is a $1000 and I can't change it to suit one of my sets.
$1000 would be a tournament chip for most people's set building.
Good luck with your decision to sell or keep it!